/* -------------------------------------------------------------------------
 *
 * wparser_def.c
 *		Default text search parser
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 *
 *
 * IDENTIFICATION
 *	  src/backend/tsearch/wparser_def.c
 *
 * -------------------------------------------------------------------------
 */

#include "postgres.h"
#include "knl/knl_variable.h"

#include "catalog/pg_collation.h"
#include "commands/defrem.h"
#include "tsearch/ts_locale.h"
#include "tsearch/ts_public.h"
#include "tsearch/ts_type.h"
#include "tsearch/ts_utils.h"
#include "utils/builtins.h"
#include "miscadmin.h"

/* Define me to enable tracing of parser behavior */
/* Output token categories */
#define ASCIIWORD 1
#define WORD_T 2
#define NUMWORD 3
#define EMAIL 4
#define URL_T 5
#define HOST 6
#define SCIENTIFIC 7
#define VERSIONNUMBER 8
#define NUMPARTHWORD 9
#define PARTHWORD 10
#define ASCIIPARTHWORD 11
#define SPACE 12
#define TAG_T 13
#define PROTOCOL 14
#define NUMHWORD 15
#define ASCIIHWORD 16
#define HWORD 17
#define URLPATH 18
#define FILEPATH 19
#define DECIMAL_T 20
#define SIGNEDINT 21
#define UNSIGNEDINT 22
#define XMLENTITY 23

#define LASTNUM 23

static const char* const tok_alias[] = {"",
    "asciiword",
    "word",
    "numword",
    "email",
    "url",
    "host",
    "sfloat",
    "version",
    "hword_numpart",
    "hword_part",
    "hword_asciipart",
    "blank",
    "tag",
    "protocol",
    "numhword",
    "asciihword",
    "hword",
    "url_path",
    "file",
    "float",
    "int",
    "uint",
    "entity"};

static const char* const lex_descr[] = {"",
    "Word, all ASCII",
    "Word, all letters",
    "Word, letters and digits",
    "Email address",
    "URL",
    "Host",
    "Scientific notation",
    "Version number",
    "Hyphenated word part, letters and digits",
    "Hyphenated word part, all letters",
    "Hyphenated word part, all ASCII",
    "Space symbols",
    "XML tag",
    "Protocol head",
    "Hyphenated word, letters and digits",
    "Hyphenated word, all ASCII",
    "Hyphenated word, all letters",
    "URL path",
    "File or path name",
    "Decimal notation",
    "Signed integer",
    "Unsigned integer",
    "XML entity"};

static const pg_wchar strange_letter[] = {
    /*
     * use binary search, so elements should be ordered
     */
    0x0903, /* DEVANAGARI SIGN VISARGA */
    0x093E, /* DEVANAGARI VOWEL SIGN AA */
    0x093F, /* DEVANAGARI VOWEL SIGN I */
    0x0940, /* DEVANAGARI VOWEL SIGN II */
    0x0949, /* DEVANAGARI VOWEL SIGN CANDRA O */
    0x094A, /* DEVANAGARI VOWEL SIGN SHORT O */
    0x094B, /* DEVANAGARI VOWEL SIGN O */
    0x094C, /* DEVANAGARI VOWEL SIGN AU */
    0x0982, /* BENGALI SIGN ANUSVARA */
    0x0983, /* BENGALI SIGN VISARGA */
    0x09BE, /* BENGALI VOWEL SIGN AA */
    0x09BF, /* BENGALI VOWEL SIGN I */
    0x09C0, /* BENGALI VOWEL SIGN II */
    0x09C7, /* BENGALI VOWEL SIGN E */
    0x09C8, /* BENGALI VOWEL SIGN AI */
    0x09CB, /* BENGALI VOWEL SIGN O */
    0x09CC, /* BENGALI VOWEL SIGN AU */
    0x09D7, /* BENGALI AU LENGTH MARK */
    0x0A03, /* GURMUKHI SIGN VISARGA */
    0x0A3E, /* GURMUKHI VOWEL SIGN AA */
    0x0A3F, /* GURMUKHI VOWEL SIGN I */
    0x0A40, /* GURMUKHI VOWEL SIGN II */
    0x0A83, /* GUJARATI SIGN VISARGA */
    0x0ABE, /* GUJARATI VOWEL SIGN AA */
    0x0ABF, /* GUJARATI VOWEL SIGN I */
    0x0AC0, /* GUJARATI VOWEL SIGN II */
    0x0AC9, /* GUJARATI VOWEL SIGN CANDRA O */
    0x0ACB, /* GUJARATI VOWEL SIGN O */
    0x0ACC, /* GUJARATI VOWEL SIGN AU */
    0x0B02, /* ORIYA SIGN ANUSVARA */
    0x0B03, /* ORIYA SIGN VISARGA */
    0x0B3E, /* ORIYA VOWEL SIGN AA */
    0x0B40, /* ORIYA VOWEL SIGN II */
    0x0B47, /* ORIYA VOWEL SIGN E */
    0x0B48, /* ORIYA VOWEL SIGN AI */
    0x0B4B, /* ORIYA VOWEL SIGN O */
    0x0B4C, /* ORIYA VOWEL SIGN AU */
    0x0B57, /* ORIYA AU LENGTH MARK */
    0x0BBE, /* TAMIL VOWEL SIGN AA */
    0x0BBF, /* TAMIL VOWEL SIGN I */
    0x0BC1, /* TAMIL VOWEL SIGN U */
    0x0BC2, /* TAMIL VOWEL SIGN UU */
    0x0BC6, /* TAMIL VOWEL SIGN E */
    0x0BC7, /* TAMIL VOWEL SIGN EE */
    0x0BC8, /* TAMIL VOWEL SIGN AI */
    0x0BCA, /* TAMIL VOWEL SIGN O */
    0x0BCB, /* TAMIL VOWEL SIGN OO */
    0x0BCC, /* TAMIL VOWEL SIGN AU */
    0x0BD7, /* TAMIL AU LENGTH MARK */
    0x0C01, /* TELUGU SIGN CANDRABINDU */
    0x0C02, /* TELUGU SIGN ANUSVARA */
    0x0C03, /* TELUGU SIGN VISARGA */
    0x0C41, /* TELUGU VOWEL SIGN U */
    0x0C42, /* TELUGU VOWEL SIGN UU */
    0x0C43, /* TELUGU VOWEL SIGN VOCALIC R */
    0x0C44, /* TELUGU VOWEL SIGN VOCALIC RR */
    0x0C82, /* KANNADA SIGN ANUSVARA */
    0x0C83, /* KANNADA SIGN VISARGA */
    0x0CBE, /* KANNADA VOWEL SIGN AA */
    0x0CC0, /* KANNADA VOWEL SIGN II */
    0x0CC1, /* KANNADA VOWEL SIGN U */
    0x0CC2, /* KANNADA VOWEL SIGN UU */
    0x0CC3, /* KANNADA VOWEL SIGN VOCALIC R */
    0x0CC4, /* KANNADA VOWEL SIGN VOCALIC RR */
    0x0CC7, /* KANNADA VOWEL SIGN EE */
    0x0CC8, /* KANNADA VOWEL SIGN AI */
    0x0CCA, /* KANNADA VOWEL SIGN O */
    0x0CCB, /* KANNADA VOWEL SIGN OO */
    0x0CD5, /* KANNADA LENGTH MARK */
    0x0CD6, /* KANNADA AI LENGTH MARK */
    0x0D02, /* MALAYALAM SIGN ANUSVARA */
    0x0D03, /* MALAYALAM SIGN VISARGA */
    0x0D3E, /* MALAYALAM VOWEL SIGN AA */
    0x0D3F, /* MALAYALAM VOWEL SIGN I */
    0x0D40, /* MALAYALAM VOWEL SIGN II */
    0x0D46, /* MALAYALAM VOWEL SIGN E */
    0x0D47, /* MALAYALAM VOWEL SIGN EE */
    0x0D48, /* MALAYALAM VOWEL SIGN AI */
    0x0D4A, /* MALAYALAM VOWEL SIGN O */
    0x0D4B, /* MALAYALAM VOWEL SIGN OO */
    0x0D4C, /* MALAYALAM VOWEL SIGN AU */
    0x0D57, /* MALAYALAM AU LENGTH MARK */
    0x0D82, /* SINHALA SIGN ANUSVARAYA */
    0x0D83, /* SINHALA SIGN VISARGAYA */
    0x0DCF, /* SINHALA VOWEL SIGN AELA-PILLA */
    0x0DD0, /* SINHALA VOWEL SIGN KETTI AEDA-PILLA */
    0x0DD1, /* SINHALA VOWEL SIGN DIGA AEDA-PILLA */
    0x0DD8, /* SINHALA VOWEL SIGN GAETTA-PILLA */
    0x0DD9, /* SINHALA VOWEL SIGN KOMBUVA */
    0x0DDA, /* SINHALA VOWEL SIGN DIGA KOMBUVA */
    0x0DDB, /* SINHALA VOWEL SIGN KOMBU DEKA */
    0x0DDC, /* SINHALA VOWEL SIGN KOMBUVA HAA AELA-PILLA */
    0x0DDD, /* SINHALA VOWEL SIGN KOMBUVA HAA DIGA AELA-PILLA */
    0x0DDE, /* SINHALA VOWEL SIGN KOMBUVA HAA GAYANUKITTA */
    0x0DDF, /* SINHALA VOWEL SIGN GAYANUKITTA */
    0x0DF2, /* SINHALA VOWEL SIGN DIGA GAETTA-PILLA */
    0x0DF3, /* SINHALA VOWEL SIGN DIGA GAYANUKITTA */
    0x0F3E, /* TIBETAN SIGN YAR TSHES */
    0x0F3F, /* TIBETAN SIGN MAR TSHES */
    0x0F7F, /* TIBETAN SIGN RNAM BCAD */
    0x102B, /* MYANMAR VOWEL SIGN TALL AA */
    0x102C, /* MYANMAR VOWEL SIGN AA */
    0x1031, /* MYANMAR VOWEL SIGN E */
    0x1038, /* MYANMAR SIGN VISARGA */
    0x103B, /* MYANMAR CONSONANT SIGN MEDIAL YA */
    0x103C, /* MYANMAR CONSONANT SIGN MEDIAL RA */
    0x1056, /* MYANMAR VOWEL SIGN VOCALIC R */
    0x1057, /* MYANMAR VOWEL SIGN VOCALIC RR */
    0x1062, /* MYANMAR VOWEL SIGN SGAW KAREN EU */
    0x1063, /* MYANMAR TONE MARK SGAW KAREN HATHI */
    0x1064, /* MYANMAR TONE MARK SGAW KAREN KE PHO */
    0x1067, /* MYANMAR VOWEL SIGN WESTERN PWO KAREN EU */
    0x1068, /* MYANMAR VOWEL SIGN WESTERN PWO KAREN UE */
    0x1069, /* MYANMAR SIGN WESTERN PWO KAREN TONE-1 */
    0x106A, /* MYANMAR SIGN WESTERN PWO KAREN TONE-2 */
    0x106B, /* MYANMAR SIGN WESTERN PWO KAREN TONE-3 */
    0x106C, /* MYANMAR SIGN WESTERN PWO KAREN TONE-4 */
    0x106D, /* MYANMAR SIGN WESTERN PWO KAREN TONE-5 */
    0x1083, /* MYANMAR VOWEL SIGN SHAN AA */
    0x1084, /* MYANMAR VOWEL SIGN SHAN E */
    0x1087, /* MYANMAR SIGN SHAN TONE-2 */
    0x1088, /* MYANMAR SIGN SHAN TONE-3 */
    0x1089, /* MYANMAR SIGN SHAN TONE-5 */
    0x108A, /* MYANMAR SIGN SHAN TONE-6 */
    0x108B, /* MYANMAR SIGN SHAN COUNCIL TONE-2 */
    0x108C, /* MYANMAR SIGN SHAN COUNCIL TONE-3 */
    0x108F, /* MYANMAR SIGN RUMAI PALAUNG TONE-5 */
    0x17B6, /* KHMER VOWEL SIGN AA */
    0x17BE, /* KHMER VOWEL SIGN OE */
    0x17BF, /* KHMER VOWEL SIGN YA */
    0x17C0, /* KHMER VOWEL SIGN IE */
    0x17C1, /* KHMER VOWEL SIGN E */
    0x17C2, /* KHMER VOWEL SIGN AE */
    0x17C3, /* KHMER VOWEL SIGN AI */
    0x17C4, /* KHMER VOWEL SIGN OO */
    0x17C5, /* KHMER VOWEL SIGN AU */
    0x17C7, /* KHMER SIGN REAHMUK */
    0x17C8, /* KHMER SIGN YUUKALEAPINTU */
    0x1923, /* LIMBU VOWEL SIGN EE */
    0x1924, /* LIMBU VOWEL SIGN AI */
    0x1925, /* LIMBU VOWEL SIGN OO */
    0x1926, /* LIMBU VOWEL SIGN AU */
    0x1929, /* LIMBU SUBJOINED LETTER YA */
    0x192A, /* LIMBU SUBJOINED LETTER RA */
    0x192B, /* LIMBU SUBJOINED LETTER WA */
    0x1930, /* LIMBU SMALL LETTER KA */
    0x1931, /* LIMBU SMALL LETTER NGA */
    0x1933, /* LIMBU SMALL LETTER TA */
    0x1934, /* LIMBU SMALL LETTER NA */
    0x1935, /* LIMBU SMALL LETTER PA */
    0x1936, /* LIMBU SMALL LETTER MA */
    0x1937, /* LIMBU SMALL LETTER RA */
    0x1938, /* LIMBU SMALL LETTER LA */
    0x19B0, /* NEW TAI LUE VOWEL SIGN VOWEL SHORTENER */
    0x19B1, /* NEW TAI LUE VOWEL SIGN AA */
    0x19B2, /* NEW TAI LUE VOWEL SIGN II */
    0x19B3, /* NEW TAI LUE VOWEL SIGN U */
    0x19B4, /* NEW TAI LUE VOWEL SIGN UU */
    0x19B5, /* NEW TAI LUE VOWEL SIGN E */
    0x19B6, /* NEW TAI LUE VOWEL SIGN AE */
    0x19B7, /* NEW TAI LUE VOWEL SIGN O */
    0x19B8, /* NEW TAI LUE VOWEL SIGN OA */
    0x19B9, /* NEW TAI LUE VOWEL SIGN UE */
    0x19BA, /* NEW TAI LUE VOWEL SIGN AY */
    0x19BB, /* NEW TAI LUE VOWEL SIGN AAY */
    0x19BC, /* NEW TAI LUE VOWEL SIGN UY */
    0x19BD, /* NEW TAI LUE VOWEL SIGN OY */
    0x19BE, /* NEW TAI LUE VOWEL SIGN OAY */
    0x19BF, /* NEW TAI LUE VOWEL SIGN UEY */
    0x19C0, /* NEW TAI LUE VOWEL SIGN IY */
    0x19C8, /* NEW TAI LUE TONE MARK-1 */
    0x19C9, /* NEW TAI LUE TONE MARK-2 */
    0x1A19, /* BUGINESE VOWEL SIGN E */
    0x1A1A, /* BUGINESE VOWEL SIGN O */
    0x1A1B, /* BUGINESE VOWEL SIGN AE */
    0x1B04, /* BALINESE SIGN BISAH */
    0x1B35, /* BALINESE VOWEL SIGN TEDUNG */
    0x1B3B, /* BALINESE VOWEL SIGN RA REPA TEDUNG */
    0x1B3D, /* BALINESE VOWEL SIGN LA LENGA TEDUNG */
    0x1B3E, /* BALINESE VOWEL SIGN TALING */
    0x1B3F, /* BALINESE VOWEL SIGN TALING REPA */
    0x1B40, /* BALINESE VOWEL SIGN TALING TEDUNG */
    0x1B41, /* BALINESE VOWEL SIGN TALING REPA TEDUNG */
    0x1B43, /* BALINESE VOWEL SIGN PEPET TEDUNG */
    0x1B44, /* BALINESE ADEG ADEG */
    0x1B82, /* SUNDANESE SIGN PANGWISAD */
    0x1BA1, /* SUNDANESE CONSONANT SIGN PAMINGKAL */
    0x1BA6, /* SUNDANESE VOWEL SIGN PANAELAENG */
    0x1BA7, /* SUNDANESE VOWEL SIGN PANOLONG */
    0x1BAA, /* SUNDANESE SIGN PAMAAEH */
    0x1C24, /* LEPCHA SUBJOINED LETTER YA */
    0x1C25, /* LEPCHA SUBJOINED LETTER RA */
    0x1C26, /* LEPCHA VOWEL SIGN AA */
    0x1C27, /* LEPCHA VOWEL SIGN I */
    0x1C28, /* LEPCHA VOWEL SIGN O */
    0x1C29, /* LEPCHA VOWEL SIGN OO */
    0x1C2A, /* LEPCHA VOWEL SIGN U */
    0x1C2B, /* LEPCHA VOWEL SIGN UU */
    0x1C34, /* LEPCHA CONSONANT SIGN NYIN-DO */
    0x1C35, /* LEPCHA CONSONANT SIGN KANG */
    0xA823, /* SYLOTI NAGRI VOWEL SIGN A */
    0xA824, /* SYLOTI NAGRI VOWEL SIGN I */
    0xA827, /* SYLOTI NAGRI VOWEL SIGN OO */
    0xA880, /* SAURASHTRA SIGN ANUSVARA */
    0xA881, /* SAURASHTRA SIGN VISARGA */
    0xA8B4, /* SAURASHTRA CONSONANT SIGN HAARU */
    0xA8B5, /* SAURASHTRA VOWEL SIGN AA */
    0xA8B6, /* SAURASHTRA VOWEL SIGN I */
    0xA8B7, /* SAURASHTRA VOWEL SIGN II */
    0xA8B8, /* SAURASHTRA VOWEL SIGN U */
    0xA8B9, /* SAURASHTRA VOWEL SIGN UU */
    0xA8BA, /* SAURASHTRA VOWEL SIGN VOCALIC R */
    0xA8BB, /* SAURASHTRA VOWEL SIGN VOCALIC RR */
    0xA8BC, /* SAURASHTRA VOWEL SIGN VOCALIC L */
    0xA8BD, /* SAURASHTRA VOWEL SIGN VOCALIC LL */
    0xA8BE, /* SAURASHTRA VOWEL SIGN E */
    0xA8BF, /* SAURASHTRA VOWEL SIGN EE */
    0xA8C0, /* SAURASHTRA VOWEL SIGN AI */
    0xA8C1, /* SAURASHTRA VOWEL SIGN O */
    0xA8C2, /* SAURASHTRA VOWEL SIGN OO */
    0xA8C3, /* SAURASHTRA VOWEL SIGN AU */
    0xA952, /* REJANG CONSONANT SIGN H */
    0xA953, /* REJANG VIRAMA */
    0xAA2F, /* CHAM VOWEL SIGN O */
    0xAA30, /* CHAM VOWEL SIGN AI */
    0xAA33, /* CHAM CONSONANT SIGN YA */
    0xAA34, /* CHAM CONSONANT SIGN RA */
    0xAA4D  /* CHAM CONSONANT SIGN FINAL H */
};

/* Parser states */
typedef enum {
    TPS_Base = 0,
    TPS_InNumWord,
    TPS_InAsciiWord,
    TPS_InWord,
    TPS_InUnsignedInt,
    TPS_InSignedIntFirst,
    TPS_InSignedInt,
    TPS_InSpace,
    TPS_InUDecimalFirst,
    TPS_InUDecimal,
    TPS_InDecimalFirst,
    TPS_InDecimal,
    TPS_InVerVersion,
    TPS_InSVerVersion,
    TPS_InVersionFirst,
    TPS_InVersion,
    TPS_InMantissaFirst,
    TPS_InMantissaSign,
    TPS_InMantissa,
    TPS_InXMLEntityFirst,
    TPS_InXMLEntity,
    TPS_InXMLEntityNumFirst,
    TPS_InXMLEntityNum,
    TPS_InXMLEntityHexNumFirst,
    TPS_InXMLEntityHexNum,
    TPS_InXMLEntityEnd,
    TPS_InTagFirst,
    TPS_InXMLBegin,
    TPS_InTagCloseFirst,
    TPS_InTagName,
    TPS_InTagBeginEnd,
    TPS_InTag,
    TPS_InTagEscapeK,
    TPS_InTagEscapeKK,
    TPS_InTagBackSleshed,
    TPS_InTagEnd,
    TPS_InCommentFirst,
    TPS_InCommentLast,
    TPS_InComment,
    TPS_InCloseCommentFirst,
    TPS_InCloseCommentLast,
    TPS_InCommentEnd,
    TPS_InHostFirstDomain,
    TPS_InHostDomainSecond,
    TPS_InHostDomain,
    TPS_InPortFirst,
    TPS_InPort,
    TPS_InHostFirstAN,
    TPS_InHost,
    TPS_InEmail,
    TPS_InFileFirst,
    TPS_InFileTwiddle,
    TPS_InPathFirst,
    TPS_InPathFirstFirst,
    TPS_InPathSecond,
    TPS_InFile,
    TPS_InFileNext,
    TPS_InURLPathFirst,
    TPS_InURLPathStart,
    TPS_InURLPath,
    TPS_InFURL,
    TPS_InProtocolFirst,
    TPS_InProtocolSecond,
    TPS_InProtocolEnd,
    TPS_InHyphenAsciiWordFirst,
    TPS_InHyphenAsciiWord,
    TPS_InHyphenWordFirst,
    TPS_InHyphenWord,
    TPS_InHyphenNumWordFirst,
    TPS_InHyphenNumWord,
    TPS_InHyphenDigitLookahead,
    TPS_InParseHyphen,
    TPS_InParseHyphenHyphen,
    TPS_InHyphenWordPart,
    TPS_InHyphenAsciiWordPart,
    TPS_InHyphenNumWordPart,
    TPS_InHyphenUnsignedInt,
    TPS_Null /* last state (fake value) */
} TParserState;

/* forward declaration */
struct TParser;

/* any p_is* functions except p_iseq */
typedef int (*TParserCharTest)(struct TParser*);
/* special handler for special cases... */
typedef void (*TParserSpecial)(struct TParser*);

typedef struct {
    TParserCharTest isclass;
    char c;
    uint16 flags;
    TParserState tostate;
    int type;
    TParserSpecial special;
} TParserStateActionItem;

/* Flag bits in TParserStateActionItem.flags */
#define A_NEXT 0x0000
#define A_BINGO 0x0001
#define A_POP 0x0002
#define A_PUSH 0x0004
#define A_RERUN 0x0008
#define A_CLEAR 0x0010
#define A_MERGE 0x0020
#define A_CLRALL 0x0040

typedef struct TParserPosition {
    int posbyte;      /* position of parser in bytes */
    int poschar;      /* position of parser in characters */
    int charlen;      /* length of current char */
    int lenbytetoken; /* length of token-so-far in bytes */
    int lenchartoken; /* and in chars */
    TParserState state;
    struct TParserPosition* prev;
    const TParserStateActionItem* pushedAtAction;
} TParserPosition;

typedef struct TParser {
    /* string and position information */
    char* str;  /* multibyte string */
    int lenstr; /* length of mbstring */
#ifdef USE_WIDE_UPPER_LOWER
    wchar_t* wstr;    /* wide character string */
    pg_wchar* pgwstr; /* wide character string for C-locale */
    bool usewide;
#endif

    /* State of parse */
    int charmaxlen;
    TParserPosition* state;
    bool ignore;
    bool wanthost;

    /* silly char */
    char c;

    /* out */
    char* token;
    int lenbytetoken;
    int lenchartoken;
    int type;
} TParser;

/* forward decls here */
static bool TParserGet(TParser* prs);

static TParserPosition* newTParserPosition(TParserPosition* prev)
{
    TParserPosition* res = (TParserPosition*)palloc(sizeof(TParserPosition));
    errno_t errorno = EOK;

    if (prev != NULL) {
        errorno = memcpy_s(res, sizeof(TParserPosition), prev, sizeof(TParserPosition));
        securec_check(errorno, "\0", "\0");
    } else {
        errorno = memset_s(res, sizeof(TParserPosition), 0, sizeof(TParserPosition));
        securec_check(errorno, "\0", "\0");
    }

    res->prev = prev;

    res->pushedAtAction = NULL;

    return res;
}

static TParser* TParserInit(char* str, int len, Oid cfoid)
{
    TParser* prs = (TParser*)palloc0(sizeof(TParser));

    prs->charmaxlen = pg_database_encoding_max_length();
    prs->str = str;
    prs->lenstr = len;

#ifdef USE_WIDE_UPPER_LOWER

    /*
     * Use wide char code only when max encoding length > 1.
     */
    if (prs->charmaxlen > 1) {
        Oid collation = DEFAULT_COLLATION_OID;
        const pg_locale_t mylocale = 0;

        if (unlikely(prs->lenstr < 0)) {
            ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), 
                            errmsg("the parameter  'len' should not be negative.")));
        }
        prs->usewide = true;
        if (lc_ctype_is_c(collation)) {
            /*
             * char2wchar doesn't work for C-locale and sizeof(pg_wchar) could
             * be different from sizeof(wchar_t)
             */

            if (unlikely(prs->lenstr > (int)(UINT_MAX / sizeof(pg_wchar)) - 1)) {
                ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), 
                            errmsg("the parameter 'len' is out of limit.")));
            } else {
                prs->pgwstr = (pg_wchar*)palloc(sizeof(pg_wchar) * (prs->lenstr + 1));
                pg_mb2wchar_with_len(prs->str, prs->pgwstr, prs->lenstr);
            }
        } else {
            if (unlikely(prs->lenstr > (int)(UINT_MAX / sizeof(wchar_t)) - 1)) {
                ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), 
                            errmsg("the parameter 'len' is out of limit.")));
            } else {
                prs->wstr = (wchar_t*)palloc(sizeof(wchar_t) * (prs->lenstr + 1));
                (void)char2wchar(prs->wstr, prs->lenstr + 1, prs->str, prs->lenstr, mylocale);
            }
        }
    } else {
        prs->usewide = false;
    }
#endif

    prs->state = newTParserPosition(NULL);
    prs->state->state = TPS_Base;

#ifdef WPARSER_TRACE

    /*
     * Use of %.*s here is a bit risky since it can misbehave if the data is
     * not in what libc thinks is the prevailing encoding.	However, since
     * this is just a debugging aid, we choose to live with that.
     */
    fprintf(stderr, "parsing \"%.*s\"\n", len, str);
#endif

    return prs;
}

/*
 * As an alternative to a full TParserInit one can create a
 * TParserCopy which basically is a regular TParser without a private
 * copy of the string - instead it uses the one from another TParser.
 * This is useful because at some places TParsers are created
 * recursively and the repeated copying around of the strings can
 * cause major inefficiency if the source string is long.
 * The new parser starts parsing at the original's current position.
 *
 * Obviously one must not close the original TParser before the copy.
 */
static TParser* TParserCopyInit(const TParser* orig)
{
    TParser* prs = (TParser*)palloc0(sizeof(TParser));

    prs->charmaxlen = orig->charmaxlen;
    prs->str = orig->str + orig->state->posbyte;
    prs->lenstr = orig->lenstr - orig->state->posbyte;

#ifdef USE_WIDE_UPPER_LOWER
    prs->usewide = orig->usewide;

    if (orig->pgwstr != NULL) {
        prs->pgwstr = orig->pgwstr + orig->state->poschar;
    }
    if (orig->wstr != NULL) {
        prs->wstr = orig->wstr + orig->state->poschar;
    }
#endif

    prs->state = newTParserPosition(NULL);
    prs->state->state = TPS_Base;

#ifdef WPARSER_TRACE
    /* See note above about %.*s */
    fprintf(stderr, "parsing copy of \"%.*s\"\n", prs->lenstr, prs->str);
#endif

    return prs;
}

static void TParserClose(TParser* prs)
{
    while (prs->state != NULL) {
        TParserPosition* ptr = prs->state->prev;

        pfree_ext(prs->state);
        prs->state = ptr;
    }

#ifdef USE_WIDE_UPPER_LOWER
    if (prs->wstr != NULL) {
        pfree_ext(prs->wstr);
    }
    if (prs->pgwstr != NULL) {
        pfree_ext(prs->pgwstr);
    }
#endif

#ifdef WPARSER_TRACE
    fprintf(stderr, "closing parser\n");
#endif
    pfree_ext(prs);
}

/*
 * Close a parser created with TParserCopyInit
 */
static void TParserCopyClose(TParser* prs)
{
    while (prs->state != NULL) {
        TParserPosition* ptr = prs->state->prev;

        pfree_ext(prs->state);
        prs->state = ptr;
    }

#ifdef WPARSER_TRACE
    fprintf(stderr, "closing parser copy\n");
#endif
    pfree_ext(prs);
}

/*
 * Character-type support functions, equivalent to is* macros, but
 * working with any possible encodings and locales. Notes:
 *	- with multibyte encoding and C-locale isw* function may fail
 *	  or give wrong result.
 *	- multibyte encoding and C-locale often are used for
 *	  Asian languages.
 *	- if locale is C the we use pgwstr instead of wstr
 */
#ifdef USE_WIDE_UPPER_LOWER
        
#define p_iswhat(type)                                                        \
    static int p_is##type(TParser* prs)                                       \
    {                                                                         \
        Assert(prs->state);                                                   \
        if (prs->usewide) {                                                   \
            if (prs->pgwstr != NULL) {                                        \
                return is##type(0xff & *(prs->pgwstr + prs->state->poschar)); \
            }                                                                 \
            return isw##type(*(wint_t*)(prs->wstr + prs->state->poschar));    \
        }                                                                     \
        return is##type(*(unsigned char*)(prs->str + prs->state->posbyte));   \
    }                                                                         \
    static int p_isnot##type(TParser* prs)                                    \
    {                                                                         \
        return !p_is##type(prs);                                              \
    }

static int p_isalnum(TParser* prs)
{
    Assert(prs->state);

    if (prs->usewide) {
        if (prs->pgwstr != NULL) {
            unsigned int c = *(prs->pgwstr + prs->state->poschar);

            /*
             * any non-ascii symbol with multibyte encoding with C-locale is
             * an alpha character
             */
            if (c > 0x7f) {
                return 1;
            }

            return isalnum(0xff & c);
        }

        return iswalnum((wint_t) * (prs->wstr + prs->state->poschar));
    }

    return isalnum(*(unsigned char*)(prs->str + prs->state->posbyte));
}
static int p_isnotalnum(TParser* prs)
{
    return !p_isalnum(prs);
}

static int p_isalpha(TParser* prs)
{
    Assert(prs->state);

    if (prs->usewide) {
        if (prs->pgwstr != NULL) {
            unsigned int c = *(prs->pgwstr + prs->state->poschar);

            /*
             * any non-ascii symbol with multibyte encoding with C-locale is
             * an alpha character
             */
            if (c > 0x7f) {
                return 1;
            }

            return isalpha(0xff & c);
        }

        return iswalpha((wint_t) * (prs->wstr + prs->state->poschar));
    }

    return isalpha(*(unsigned char*)(prs->str + prs->state->posbyte));
}

static int p_isnotalpha(TParser* prs)
{
    return !p_isalpha(prs);
}

/* p_iseq should be used only for ascii symbols */
static int p_iseq(TParser* prs, char c)
{
    Assert(prs->state);
    return ((prs->state->charlen == 1 && *(prs->str + prs->state->posbyte) == c)) ? 1 : 0;
}
#else /* USE_WIDE_UPPER_LOWER */

#define p_iswhat(type)                                                     \
    static int p_is##type(TParser* prs)                                    \
    {                                                                      \
        Assert(prs->state);                                                \
        return is##type((unsigned char)*(prs->str + prs->state->posbyte)); \
    }                                                                      \
    static int p_isnot##type(TParser* prs)                                 \
    {                                                                      \
        return !p_is##type(prs);                                           \
    }

static int p_iseq(TParser* prs, char c)
{
    Assert(prs->state);
    return (*(prs->str + prs->state->posbyte) == c) ? 1 : 0;
}

p_iswhat(alnum) p_iswhat(alpha)
#endif /* USE_WIDE_UPPER_LOWER */

p_iswhat(digit) p_iswhat(lower) p_iswhat(print) p_iswhat(punct) p_iswhat(space) p_iswhat(upper) p_iswhat(xdigit)

    static int p_isEOF(TParser* prs)
{
    Assert(prs->state);
    return (prs->state->posbyte == prs->lenstr || prs->state->charlen == 0) ? 1 : 0;
}

static int p_iseqC(TParser* prs)
{
    return p_iseq(prs, prs->c);
}

static int p_isneC(TParser* prs)
{
    return !p_iseq(prs, prs->c);
}

static int p_isascii(TParser* prs)
{
    return (prs->state->charlen == 1 && isascii((unsigned char)*(prs->str + prs->state->posbyte))) ? 1 : 0;
}

static int p_isasclet(TParser* prs)
{
    return (p_isascii(prs) && p_isalpha(prs)) ? 1 : 0;
}

static int p_isurlchar(TParser* prs)
{
    char ch;

    /* no non-ASCII need apply */
    if (prs->state->charlen != 1) {
        return 0;
    }
    ch = *(prs->str + prs->state->posbyte);
    /* no spaces or control characters */
    if (ch <= 0x20 || ch >= 0x7F) {
        return 0;
    }
    /* reject characters disallowed by RFC 3986 */
    switch (ch) {
        case '"':
        case '<':
        case '>':
        case '\\':
        case '^':
        case '`':
        case '{':
        case '|':
        case '}':
            return 0;
        default:
            break;
    }
    return 1;
}

/* deliberately suppress unused-function complaints for the above */
void _make_compiler_happy(void);
void _make_compiler_happy(void)
{
    p_isalnum(NULL);
    p_isnotalnum(NULL);
    p_isalpha(NULL);
    p_isnotalpha(NULL);
    p_isdigit(NULL);
    p_isnotdigit(NULL);
    p_islower(NULL);
    p_isnotlower(NULL);
    p_isprint(NULL);
    p_isnotprint(NULL);
    p_ispunct(NULL);
    p_isnotpunct(NULL);
    p_isspace(NULL);
    p_isnotspace(NULL);
    p_isupper(NULL);
    p_isnotupper(NULL);
    p_isxdigit(NULL);
    p_isnotxdigit(NULL);
    p_isEOF(NULL);
    p_iseqC(NULL);
    p_isneC(NULL);
}

static void SpecialTags(TParser* prs)
{
    switch (prs->state->lenchartoken) {
        case 8: /* </script */
            if (pg_strncasecmp(prs->token, "</script", 8) == 0) {
                prs->ignore = false;
            }
            break;
        case 7: /* <script || </style */
            if (pg_strncasecmp(prs->token, "</style", 7) == 0) {
                prs->ignore = false;
            } else if (pg_strncasecmp(prs->token, "<script", 7) == 0) {
                prs->ignore = true;
            }
            break;
        case 6: /* <style */
            if (pg_strncasecmp(prs->token, "<style", 6) == 0) {
                prs->ignore = true;
            }
            break;
        default:
            break;
    }
}

static void SpecialFURL(TParser* prs)
{
    prs->wanthost = true;
    prs->state->posbyte -= prs->state->lenbytetoken;
    prs->state->poschar -= prs->state->lenchartoken;
}

static void SpecialHyphen(TParser* prs)
{
    prs->state->posbyte -= prs->state->lenbytetoken;
    prs->state->poschar -= prs->state->lenchartoken;
}

static void SpecialVerVersion(TParser* prs)
{
    prs->state->posbyte -= prs->state->lenbytetoken;
    prs->state->poschar -= prs->state->lenchartoken;
    prs->state->lenbytetoken = 0;
    prs->state->lenchartoken = 0;
}

static int p_isstophost(TParser* prs)
{
    if (prs->wanthost) {
        prs->wanthost = false;
        return 1;
    }
    return 0;
}

static int p_isignore(TParser* prs)
{
    return (prs->ignore) ? 1 : 0;
}

static int p_ishost(TParser* prs)
{
    TParser* tmpprs = TParserCopyInit(prs);
    int res = 0;

    tmpprs->wanthost = true;

    check_stack_depth();

    if (TParserGet(tmpprs) && tmpprs->type == HOST) {
        prs->state->posbyte += tmpprs->lenbytetoken;
        prs->state->poschar += tmpprs->lenchartoken;
        prs->state->lenbytetoken += tmpprs->lenbytetoken;
        prs->state->lenchartoken += tmpprs->lenchartoken;
        prs->state->charlen = tmpprs->state->charlen;
        res = 1;
    }
    TParserCopyClose(tmpprs);

    return res;
}

static int p_isURLPath(TParser* prs)
{
    TParser* tmpprs = TParserCopyInit(prs);
    int res = 0;

    tmpprs->state = newTParserPosition(tmpprs->state);
    tmpprs->state->state = TPS_InURLPathFirst;

    if (TParserGet(tmpprs) && tmpprs->type == URLPATH) {
        prs->state->posbyte += tmpprs->lenbytetoken;
        prs->state->poschar += tmpprs->lenchartoken;
        prs->state->lenbytetoken += tmpprs->lenbytetoken;
        prs->state->lenchartoken += tmpprs->lenchartoken;
        prs->state->charlen = tmpprs->state->charlen;
        res = 1;
    }
    TParserCopyClose(tmpprs);

    return res;
}

/*
 * returns true if current character has zero display length or
 * it's a special sign in several languages. Such characters
 * aren't a word-breaker although they aren't an isalpha.
 * In beginning of word they aren't a part of it.
 */
static int p_isspecial(TParser* prs)
{
    /*
     * pg_dsplen could return -1 which means error or control character
     */
    if (pg_dsplen(prs->str + prs->state->posbyte) == 0) {
        return 1;
    }

#ifdef USE_WIDE_UPPER_LOWER

    /*
     * Unicode Characters in the 'Mark, Spacing Combining' Category That
     * characters are not alpha although they are not breakers of word too.
     * Check that only in utf encoding, because other encodings aren't
     * supported by openGauss or even exists.
     */
    if (GetDatabaseEncoding() == PG_UTF8 && prs->usewide) {
        const pg_wchar *StopLow = strange_letter;
        const pg_wchar *StopHigh = strange_letter + lengthof(strange_letter);
        const pg_wchar *StopMiddle = NULL;
        pg_wchar c;

        if (prs->pgwstr != NULL) {
            c = *(prs->pgwstr + prs->state->poschar);
        } else {
            c = (pg_wchar) * (prs->wstr + prs->state->poschar);
        }

        while (StopLow < StopHigh) {
            StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
            if (*StopMiddle == c) {
                return 1;
            }
            else if (*StopMiddle < c) {
                StopLow = StopMiddle + 1;
            } else {
                StopHigh = StopMiddle;
            }
        }
    }
#endif

    return 0;
}

/*
 * Table of state/action of parser
 */
static const TParserStateActionItem actionTPS_Base[] = {{p_isEOF, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '<', A_PUSH, TPS_InTagFirst, 0, NULL},
    {p_isignore, 0, A_NEXT, TPS_InSpace, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InAsciiWord, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InWord, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InUnsignedInt, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InSignedIntFirst, 0, NULL},
    {p_iseqC, '+', A_PUSH, TPS_InSignedIntFirst, 0, NULL},
    {p_iseqC, '&', A_PUSH, TPS_InXMLEntityFirst, 0, NULL},
    {p_iseqC, '~', A_PUSH, TPS_InFileTwiddle, 0, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFileFirst, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InPathFirstFirst, 0, NULL},
    {NULL, 0, A_NEXT, TPS_InSpace, 0, NULL}};

static const TParserStateActionItem actionTPS_InNumWord[] = {{p_isEOF, 0, A_BINGO, TPS_Base, NUMWORD, NULL},
    {p_isalnum, 0, A_NEXT, TPS_InNumWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InNumWord, 0, NULL},
    {p_iseqC, '@', A_PUSH, TPS_InEmail, 0, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFileFirst, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InFileNext, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHyphenNumWordFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, NUMWORD, NULL}};

static const TParserStateActionItem actionTPS_InAsciiWord[] = {{p_isEOF, 0, A_BINGO, TPS_Base, ASCIIWORD, NULL},
    {p_isasclet, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InHostFirstDomain, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InFileNext, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHyphenAsciiWordFirst, 0, NULL},
    {p_iseqC, '_', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '@', A_PUSH, TPS_InEmail, 0, NULL},
    {p_iseqC, ':', A_PUSH, TPS_InProtocolFirst, 0, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFileFirst, 0, NULL},
    {p_isdigit, 0, A_PUSH, TPS_InHost, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InNumWord, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InWord, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, ASCIIWORD, NULL}};

static const TParserStateActionItem actionTPS_InWord[] = {{p_isEOF, 0, A_BINGO, TPS_Base, WORD_T, NULL},
    {p_isalpha, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InNumWord, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHyphenWordFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, WORD_T, NULL}};

static const TParserStateActionItem actionTPS_InUnsignedInt[] = {{p_isEOF, 0, A_BINGO, TPS_Base, UNSIGNEDINT, NULL},
    {p_isdigit, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InHostFirstDomain, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InUDecimalFirst, 0, NULL},
    {p_iseqC, 'e', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {p_iseqC, 'E', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {p_isasclet, 0, A_PUSH, TPS_InHost, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InNumWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InNumWord, 0, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFileFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, UNSIGNEDINT, NULL}};

static const TParserStateActionItem actionTPS_InSignedIntFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT | A_CLEAR, TPS_InSignedInt, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InSignedInt[] = {{p_isEOF, 0, A_BINGO, TPS_Base, SIGNEDINT, NULL},
    {p_isdigit, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InDecimalFirst, 0, NULL},
    {p_iseqC, 'e', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {p_iseqC, 'E', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, SIGNEDINT, NULL}};

static const TParserStateActionItem actionTPS_InSpace[] = {{p_isEOF, 0, A_BINGO, TPS_Base, SPACE, NULL},
    {p_iseqC, '<', A_BINGO, TPS_Base, SPACE, NULL},
    {p_isignore, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_BINGO, TPS_Base, SPACE, NULL},
    {p_iseqC, '+', A_BINGO, TPS_Base, SPACE, NULL},
    {p_iseqC, '&', A_BINGO, TPS_Base, SPACE, NULL},
    {p_iseqC, '/', A_BINGO, TPS_Base, SPACE, NULL},
    {p_isnotalnum, 0, A_NEXT, TPS_InSpace, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, SPACE, NULL}};

static const TParserStateActionItem actionTPS_InUDecimalFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_CLEAR, TPS_InUDecimal, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InUDecimal[] = {{p_isEOF, 0, A_BINGO, TPS_Base, DECIMAL_T, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InUDecimal, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InVersionFirst, 0, NULL},
    {p_iseqC, 'e', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {p_iseqC, 'E', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, DECIMAL_T, NULL}};

static const TParserStateActionItem actionTPS_InDecimalFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_CLEAR, TPS_InDecimal, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InDecimal[] = {{p_isEOF, 0, A_BINGO, TPS_Base, DECIMAL_T, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InDecimal, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InVerVersion, 0, NULL},
    {p_iseqC, 'e', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {p_iseqC, 'E', A_PUSH, TPS_InMantissaFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, DECIMAL_T, NULL}};

static const TParserStateActionItem actionTPS_InVerVersion[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_RERUN, TPS_InSVerVersion, 0, SpecialVerVersion},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InSVerVersion[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_BINGO | A_CLRALL, TPS_InUnsignedInt, SPACE, NULL},
    {NULL, 0, A_NEXT, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InVersionFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_CLEAR, TPS_InVersion, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InVersion[] = {{p_isEOF, 0, A_BINGO, TPS_Base, VERSIONNUMBER, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InVersion, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InVersionFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, VERSIONNUMBER, NULL}};

static const TParserStateActionItem actionTPS_InMantissaFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_CLEAR, TPS_InMantissa, 0, NULL},
    {p_iseqC, '+', A_NEXT, TPS_InMantissaSign, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InMantissaSign, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InMantissaSign[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_CLEAR, TPS_InMantissa, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InMantissa[] = {{p_isEOF, 0, A_BINGO, TPS_Base, SCIENTIFIC, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InMantissa, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, SCIENTIFIC, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntityFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '#', A_NEXT, TPS_InXMLEntityNumFirst, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, ':', A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_InXMLEntity, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntity[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isalnum, 0, A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, ':', A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, '.', A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InXMLEntity, 0, NULL},
    {p_iseqC, ';', A_NEXT, TPS_InXMLEntityEnd, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntityNumFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, 'x', A_NEXT, TPS_InXMLEntityHexNumFirst, 0, NULL},
    {p_iseqC, 'X', A_NEXT, TPS_InXMLEntityHexNumFirst, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InXMLEntityNum, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntityHexNumFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isxdigit, 0, A_NEXT, TPS_InXMLEntityHexNum, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntityNum[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InXMLEntityNum, 0, NULL},
    {p_iseqC, ';', A_NEXT, TPS_InXMLEntityEnd, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntityHexNum[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isxdigit, 0, A_NEXT, TPS_InXMLEntityHexNum, 0, NULL},
    {p_iseqC, ';', A_NEXT, TPS_InXMLEntityEnd, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLEntityEnd[] = {
    {NULL, 0, A_BINGO | A_CLEAR, TPS_Base, XMLENTITY, NULL}};

static const TParserStateActionItem actionTPS_InTagFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InTagCloseFirst, 0, NULL},
    {p_iseqC, '!', A_PUSH, TPS_InCommentFirst, 0, NULL},
    {p_iseqC, '?', A_PUSH, TPS_InXMLBegin, 0, NULL},
    {p_isasclet, 0, A_PUSH, TPS_InTagName, 0, NULL},
    {p_iseqC, ':', A_PUSH, TPS_InTagName, 0, NULL},
    {p_iseqC, '_', A_PUSH, TPS_InTagName, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InXMLBegin[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    /* <?xml ... */
    /* XXX do we wants states for the m and l ?  Right now this accepts <?xZ */
    {p_iseqC, 'x', A_NEXT, TPS_InTag, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagCloseFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InTagName, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagName[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    /* <br/> case */
    {p_iseqC, '/', A_NEXT, TPS_InTagBeginEnd, 0, NULL},
    {p_iseqC, '>', A_NEXT, TPS_InTagEnd, 0, SpecialTags},
    {p_isspace, 0, A_NEXT, TPS_InTag, 0, SpecialTags},
    {p_isalnum, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, ':', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '.', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_Null, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagBeginEnd[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '>', A_NEXT, TPS_InTagEnd, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InTag[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '>', A_NEXT, TPS_InTagEnd, 0, SpecialTags},
    {p_iseqC, '\'', A_NEXT, TPS_InTagEscapeK, 0, NULL},
    {p_iseqC, '"', A_NEXT, TPS_InTagEscapeKK, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '=', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '#', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '/', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, ':', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '.', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '&', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '?', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '%', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '~', A_NEXT, TPS_Null, 0, NULL},
    {p_isspace, 0, A_NEXT, TPS_Null, 0, SpecialTags},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagEscapeK[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '\\', A_PUSH, TPS_InTagBackSleshed, 0, NULL},
    {p_iseqC, '\'', A_NEXT, TPS_InTag, 0, NULL},
    {NULL, 0, A_NEXT, TPS_InTagEscapeK, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagEscapeKK[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '\\', A_PUSH, TPS_InTagBackSleshed, 0, NULL},
    {p_iseqC, '"', A_NEXT, TPS_InTag, 0, NULL},
    {NULL, 0, A_NEXT, TPS_InTagEscapeKK, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagBackSleshed[] = {
    {p_isEOF, 0, A_POP, TPS_Null, 0, NULL}, {NULL, 0, A_MERGE, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InTagEnd[] = {{NULL, 0, A_BINGO | A_CLRALL, TPS_Base, TAG_T, NULL}};

static const TParserStateActionItem actionTPS_InCommentFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InCommentLast, 0, NULL},
    /* <!DOCTYPE ...> */
    {p_iseqC, 'D', A_NEXT, TPS_InTag, 0, NULL},
    {p_iseqC, 'd', A_NEXT, TPS_InTag, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InCommentLast[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InComment, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InComment[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InCloseCommentFirst, 0, NULL},
    {NULL, 0, A_NEXT, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InCloseCommentFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InCloseCommentLast, 0, NULL},
    {NULL, 0, A_NEXT, TPS_InComment, 0, NULL}};

static const TParserStateActionItem actionTPS_InCloseCommentLast[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_Null, 0, NULL},
    {p_iseqC, '>', A_NEXT, TPS_InCommentEnd, 0, NULL},
    {NULL, 0, A_NEXT, TPS_InComment, 0, NULL}};

static const TParserStateActionItem actionTPS_InCommentEnd[] = {{NULL, 0, A_BINGO | A_CLRALL, TPS_Base, TAG_T, NULL}};

static const TParserStateActionItem actionTPS_InHostFirstDomain[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHostDomainSecond, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHost, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHostDomainSecond[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHostDomain, 0, NULL},
    {p_isdigit, 0, A_PUSH, TPS_InHost, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '_', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InHostFirstDomain, 0, NULL},
    {p_iseqC, '@', A_PUSH, TPS_InEmail, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHostDomain[] = {{p_isEOF, 0, A_BINGO | A_CLRALL, TPS_Base, HOST, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHostDomain, 0, NULL},
    {p_isdigit, 0, A_PUSH, TPS_InHost, 0, NULL},
    {p_iseqC, ':', A_PUSH, TPS_InPortFirst, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '_', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InHostFirstDomain, 0, NULL},
    {p_iseqC, '@', A_PUSH, TPS_InEmail, 0, NULL},
    {p_isdigit, 0, A_POP, TPS_Null, 0, NULL},
    {p_isstophost, 0, A_BINGO | A_CLRALL, TPS_InURLPathStart, HOST, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFURL, 0, NULL},
    {NULL, 0, A_BINGO | A_CLRALL, TPS_Base, HOST, NULL}};

static const TParserStateActionItem actionTPS_InPortFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InPort, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InPort[] = {{p_isEOF, 0, A_BINGO | A_CLRALL, TPS_Base, HOST, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InPort, 0, NULL},
    {p_isstophost, 0, A_BINGO | A_CLRALL, TPS_InURLPathStart, HOST, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFURL, 0, NULL},
    {NULL, 0, A_BINGO | A_CLRALL, TPS_Base, HOST, NULL}};

static const TParserStateActionItem actionTPS_InHostFirstAN[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHost, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHost, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHost[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHost, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHost, 0, NULL},
    {p_iseqC, '@', A_PUSH, TPS_InEmail, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InHostFirstDomain, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {p_iseqC, '_', A_PUSH, TPS_InHostFirstAN, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InEmail[] = {{p_isstophost, 0, A_POP, TPS_Null, 0, NULL},
    {p_ishost, 0, A_BINGO | A_CLRALL, TPS_Base, EMAIL, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InFileFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '.', A_NEXT, TPS_InPathFirst, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '~', A_PUSH, TPS_InFileTwiddle, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InFileTwiddle[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '/', A_NEXT, TPS_InFileFirst, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InPathFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '.', A_NEXT, TPS_InPathSecond, 0, NULL},
    {p_iseqC, '/', A_NEXT, TPS_InFileFirst, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InPathFirstFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '.', A_NEXT, TPS_InPathSecond, 0, NULL},
    {p_iseqC, '/', A_NEXT, TPS_InFileFirst, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InPathSecond[] = {
    {p_isEOF, 0, A_BINGO | A_CLEAR, TPS_Base, FILEPATH, NULL},
    {p_iseqC, '/', A_NEXT | A_PUSH, TPS_InFileFirst, 0, NULL},
    {p_iseqC, '/', A_BINGO | A_CLEAR, TPS_Base, FILEPATH, NULL},
    {p_isspace, 0, A_BINGO | A_CLEAR, TPS_Base, FILEPATH, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InFile[] = {{p_isEOF, 0, A_BINGO, TPS_Base, FILEPATH, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '.', A_PUSH, TPS_InFileNext, 0, NULL},
    {p_iseqC, '_', A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '-', A_NEXT, TPS_InFile, 0, NULL},
    {p_iseqC, '/', A_PUSH, TPS_InFileFirst, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, FILEPATH, NULL}};

static const TParserStateActionItem actionTPS_InFileNext[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_CLEAR, TPS_InFile, 0, NULL},
    {p_isdigit, 0, A_CLEAR, TPS_InFile, 0, NULL},
    {p_iseqC, '_', A_CLEAR, TPS_InFile, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InURLPathFirst[] = {
    {p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isurlchar, 0, A_NEXT, TPS_InURLPath, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL},
};

static const TParserStateActionItem actionTPS_InURLPathStart[] = {{NULL, 0, A_NEXT, TPS_InURLPath, 0, NULL}};

static const TParserStateActionItem actionTPS_InURLPath[] = {{p_isEOF, 0, A_BINGO, TPS_Base, URLPATH, NULL},
    {p_isurlchar, 0, A_NEXT, TPS_InURLPath, 0, NULL},
    {NULL, 0, A_BINGO, TPS_Base, URLPATH, NULL}};

static const TParserStateActionItem actionTPS_InFURL[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isURLPath, 0, A_BINGO | A_CLRALL, TPS_Base, URL_T, SpecialFURL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InProtocolFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '/', A_NEXT, TPS_InProtocolSecond, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InProtocolSecond[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_iseqC, '/', A_NEXT, TPS_InProtocolEnd, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InProtocolEnd[] = {
    {NULL, 0, A_BINGO | A_CLRALL, TPS_Base, PROTOCOL, NULL}};

static const TParserStateActionItem actionTPS_InHyphenAsciiWordFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHyphenAsciiWord, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWord, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenDigitLookahead, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHyphenAsciiWord[] = {
    {p_isEOF, 0, A_BINGO | A_CLRALL, TPS_InParseHyphen, ASCIIHWORD, SpecialHyphen},
    {p_isasclet, 0, A_NEXT, TPS_InHyphenAsciiWord, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenWord, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHyphenAsciiWordFirst, 0, NULL},
    {NULL, 0, A_BINGO | A_CLRALL, TPS_InParseHyphen, ASCIIHWORD, SpecialHyphen}};

static const TParserStateActionItem actionTPS_InHyphenWordFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWord, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenDigitLookahead, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHyphenWord[] = {
    {p_isEOF, 0, A_BINGO | A_CLRALL, TPS_InParseHyphen, HWORD, SpecialHyphen},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenWord, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHyphenWordFirst, 0, NULL},
    {NULL, 0, A_BINGO | A_CLRALL, TPS_InParseHyphen, HWORD, SpecialHyphen}};

static const TParserStateActionItem actionTPS_InHyphenNumWordFirst[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenDigitLookahead, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHyphenNumWord[] = {
    {p_isEOF, 0, A_BINGO | A_CLRALL, TPS_InParseHyphen, NUMHWORD, SpecialHyphen},
    {p_isalnum, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InHyphenNumWordFirst, 0, NULL},
    {NULL, 0, A_BINGO | A_CLRALL, TPS_InParseHyphen, NUMHWORD, SpecialHyphen}};

static const TParserStateActionItem actionTPS_InHyphenDigitLookahead[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenDigitLookahead, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenNumWord, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InParseHyphen[] = {{p_isEOF, 0, A_RERUN, TPS_Base, 0, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHyphenAsciiWordPart, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWordPart, 0, NULL},
    {p_isdigit, 0, A_PUSH, TPS_InHyphenUnsignedInt, 0, NULL},
    {p_iseqC, '-', A_PUSH, TPS_InParseHyphenHyphen, 0, NULL},
    {NULL, 0, A_RERUN, TPS_Base, 0, NULL}};

static const TParserStateActionItem actionTPS_InParseHyphenHyphen[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isalnum, 0, A_BINGO | A_CLEAR, TPS_InParseHyphen, SPACE, NULL},
    {p_isspecial, 0, A_BINGO | A_CLEAR, TPS_InParseHyphen, SPACE, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

static const TParserStateActionItem actionTPS_InHyphenWordPart[] = {{p_isEOF, 0, A_BINGO, TPS_Base, PARTHWORD, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWordPart, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenWordPart, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenNumWordPart, 0, NULL},
    {NULL, 0, A_BINGO, TPS_InParseHyphen, PARTHWORD, NULL}};

static const TParserStateActionItem actionTPS_InHyphenAsciiWordPart[] = {
    {p_isEOF, 0, A_BINGO, TPS_Base, ASCIIPARTHWORD, NULL},
    {p_isasclet, 0, A_NEXT, TPS_InHyphenAsciiWordPart, 0, NULL},
    {p_isalpha, 0, A_NEXT, TPS_InHyphenWordPart, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenWordPart, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_InHyphenNumWordPart, 0, NULL},
    {NULL, 0, A_BINGO, TPS_InParseHyphen, ASCIIPARTHWORD, NULL}};

static const TParserStateActionItem actionTPS_InHyphenNumWordPart[] = {
    {p_isEOF, 0, A_BINGO, TPS_Base, NUMPARTHWORD, NULL},
    {p_isalnum, 0, A_NEXT, TPS_InHyphenNumWordPart, 0, NULL},
    {p_isspecial, 0, A_NEXT, TPS_InHyphenNumWordPart, 0, NULL},
    {NULL, 0, A_BINGO, TPS_InParseHyphen, NUMPARTHWORD, NULL}};

static const TParserStateActionItem actionTPS_InHyphenUnsignedInt[] = {{p_isEOF, 0, A_POP, TPS_Null, 0, NULL},
    {p_isdigit, 0, A_NEXT, TPS_Null, 0, NULL},
    {p_isalpha, 0, A_CLEAR, TPS_InHyphenNumWordPart, 0, NULL},
    {p_isspecial, 0, A_CLEAR, TPS_InHyphenNumWordPart, 0, NULL},
    {NULL, 0, A_POP, TPS_Null, 0, NULL}};

/*
 * main table of per-state parser actions
 */
typedef struct {
    const TParserStateActionItem* action; /* the actual state info */
    TParserState state;                   /* only for Assert crosscheck */
#ifdef WPARSER_TRACE
    const char* state_name; /* only for debug printout */
#endif
} TParserStateAction;

#ifdef WPARSER_TRACE
#define TPARSERSTATEACTION(state)                           \
    {                                                       \
        CppConcat(action, state), state, CppAsString(state) \
    }
#else
#define TPARSERSTATEACTION(state)       \
    {                                   \
        CppConcat(action, state), state \
    }
#endif

/*
 * order must be the same as in typedef enum {} TParserState!!
 */
static const TParserStateAction Actions[] = {TPARSERSTATEACTION(TPS_Base),
    TPARSERSTATEACTION(TPS_InNumWord),
    TPARSERSTATEACTION(TPS_InAsciiWord),
    TPARSERSTATEACTION(TPS_InWord),
    TPARSERSTATEACTION(TPS_InUnsignedInt),
    TPARSERSTATEACTION(TPS_InSignedIntFirst),
    TPARSERSTATEACTION(TPS_InSignedInt),
    TPARSERSTATEACTION(TPS_InSpace),
    TPARSERSTATEACTION(TPS_InUDecimalFirst),
    TPARSERSTATEACTION(TPS_InUDecimal),
    TPARSERSTATEACTION(TPS_InDecimalFirst),
    TPARSERSTATEACTION(TPS_InDecimal),
    TPARSERSTATEACTION(TPS_InVerVersion),
    TPARSERSTATEACTION(TPS_InSVerVersion),
    TPARSERSTATEACTION(TPS_InVersionFirst),
    TPARSERSTATEACTION(TPS_InVersion),
    TPARSERSTATEACTION(TPS_InMantissaFirst),
    TPARSERSTATEACTION(TPS_InMantissaSign),
    TPARSERSTATEACTION(TPS_InMantissa),
    TPARSERSTATEACTION(TPS_InXMLEntityFirst),
    TPARSERSTATEACTION(TPS_InXMLEntity),
    TPARSERSTATEACTION(TPS_InXMLEntityNumFirst),
    TPARSERSTATEACTION(TPS_InXMLEntityNum),
    TPARSERSTATEACTION(TPS_InXMLEntityHexNumFirst),
    TPARSERSTATEACTION(TPS_InXMLEntityHexNum),
    TPARSERSTATEACTION(TPS_InXMLEntityEnd),
    TPARSERSTATEACTION(TPS_InTagFirst),
    TPARSERSTATEACTION(TPS_InXMLBegin),
    TPARSERSTATEACTION(TPS_InTagCloseFirst),
    TPARSERSTATEACTION(TPS_InTagName),
    TPARSERSTATEACTION(TPS_InTagBeginEnd),
    TPARSERSTATEACTION(TPS_InTag),
    TPARSERSTATEACTION(TPS_InTagEscapeK),
    TPARSERSTATEACTION(TPS_InTagEscapeKK),
    TPARSERSTATEACTION(TPS_InTagBackSleshed),
    TPARSERSTATEACTION(TPS_InTagEnd),
    TPARSERSTATEACTION(TPS_InCommentFirst),
    TPARSERSTATEACTION(TPS_InCommentLast),
    TPARSERSTATEACTION(TPS_InComment),
    TPARSERSTATEACTION(TPS_InCloseCommentFirst),
    TPARSERSTATEACTION(TPS_InCloseCommentLast),
    TPARSERSTATEACTION(TPS_InCommentEnd),
    TPARSERSTATEACTION(TPS_InHostFirstDomain),
    TPARSERSTATEACTION(TPS_InHostDomainSecond),
    TPARSERSTATEACTION(TPS_InHostDomain),
    TPARSERSTATEACTION(TPS_InPortFirst),
    TPARSERSTATEACTION(TPS_InPort),
    TPARSERSTATEACTION(TPS_InHostFirstAN),
    TPARSERSTATEACTION(TPS_InHost),
    TPARSERSTATEACTION(TPS_InEmail),
    TPARSERSTATEACTION(TPS_InFileFirst),
    TPARSERSTATEACTION(TPS_InFileTwiddle),
    TPARSERSTATEACTION(TPS_InPathFirst),
    TPARSERSTATEACTION(TPS_InPathFirstFirst),
    TPARSERSTATEACTION(TPS_InPathSecond),
    TPARSERSTATEACTION(TPS_InFile),
    TPARSERSTATEACTION(TPS_InFileNext),
    TPARSERSTATEACTION(TPS_InURLPathFirst),
    TPARSERSTATEACTION(TPS_InURLPathStart),
    TPARSERSTATEACTION(TPS_InURLPath),
    TPARSERSTATEACTION(TPS_InFURL),
    TPARSERSTATEACTION(TPS_InProtocolFirst),
    TPARSERSTATEACTION(TPS_InProtocolSecond),
    TPARSERSTATEACTION(TPS_InProtocolEnd),
    TPARSERSTATEACTION(TPS_InHyphenAsciiWordFirst),
    TPARSERSTATEACTION(TPS_InHyphenAsciiWord),
    TPARSERSTATEACTION(TPS_InHyphenWordFirst),
    TPARSERSTATEACTION(TPS_InHyphenWord),
    TPARSERSTATEACTION(TPS_InHyphenNumWordFirst),
    TPARSERSTATEACTION(TPS_InHyphenNumWord),
    TPARSERSTATEACTION(TPS_InHyphenDigitLookahead),
    TPARSERSTATEACTION(TPS_InParseHyphen),
    TPARSERSTATEACTION(TPS_InParseHyphenHyphen),
    TPARSERSTATEACTION(TPS_InHyphenWordPart),
    TPARSERSTATEACTION(TPS_InHyphenAsciiWordPart),
    TPARSERSTATEACTION(TPS_InHyphenNumWordPart),
    TPARSERSTATEACTION(TPS_InHyphenUnsignedInt)};

static bool TParserGet(TParser* prs)
{
    const TParserStateActionItem* item = NULL;

    Assert(prs->state);

    if (prs->state->posbyte >= prs->lenstr) {
        return false;
    }

    prs->token = prs->str + prs->state->posbyte;
    prs->state->pushedAtAction = NULL;

    /* look at string */
    while (prs->state->posbyte <= prs->lenstr) {
        if (prs->state->posbyte == prs->lenstr) {
            prs->state->charlen = 0;
        } else {
            prs->state->charlen = (prs->charmaxlen == 1) ? prs->charmaxlen : pg_mblen(prs->str + prs->state->posbyte);
        }

        if (prs->state->posbyte + prs->state->charlen > prs->lenstr) {
            ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT), errmsg("posbyte plus charlen greater than lenstr")));
        }
        Assert(prs->state->state >= TPS_Base && prs->state->state < TPS_Null);
        Assert(Actions[prs->state->state].state == prs->state->state);

        if (prs->state->pushedAtAction) {
            /* After a POP, pick up at the next test */
            item = prs->state->pushedAtAction + 1;
            prs->state->pushedAtAction = NULL;
        } else {
            item = Actions[prs->state->state].action;
            Assert(item != NULL);
        }

        /* find action by character class */
        while (item->isclass != NULL) {
            prs->c = item->c;
            if (item->isclass(prs) != 0) {
                break;
            }
            item++;
        }

#ifdef WPARSER_TRACE
        {
            TParserPosition* ptr = NULL;

            fprintf(stderr, "state ");
            /* indent according to stack depth */
            for (ptr = prs->state->prev; ptr; ptr = ptr->prev) {
                fprintf(stderr, "  ");
            }
            fprintf(stderr, "%s ", Actions[prs->state->state].state_name);
            if (prs->state->posbyte < prs->lenstr) {
                fprintf(stderr, "at %c", *(prs->str + prs->state->posbyte));
            } else {
                fprintf(stderr, "at EOF");
            }
            fprintf(stderr,
                " matched rule %d flags%s%s%s%s%s%s%s%s%s%s%s\n",
                (int)(item - Actions[prs->state->state].action),
                (item->flags & A_BINGO) ? " BINGO" : "",
                (item->flags & A_POP) ? " POP" : "",
                (item->flags & A_PUSH) ? " PUSH" : "",
                (item->flags & A_RERUN) ? " RERUN" : "",
                (item->flags & A_CLEAR) ? " CLEAR" : "",
                (item->flags & A_MERGE) ? " MERGE" : "",
                (item->flags & A_CLRALL) ? " CLRALL" : "",
                (item->tostate != TPS_Null) ? " tostate " : "",
                (item->tostate != TPS_Null) ? Actions[item->tostate].state_name : "",
                (item->type > 0) ? " type " : "",
                tok_alias[item->type]);
        }
#endif

        /* call special handler if exists */
        if (item->special != NULL) {
            item->special(prs);
        }

        /* BINGO, token is found */
        if (item->flags & A_BINGO) {
            Assert(item->type > 0);
            prs->lenbytetoken = prs->state->lenbytetoken;
            prs->lenchartoken = prs->state->lenchartoken;
            prs->state->lenbytetoken = prs->state->lenchartoken = 0;
            prs->type = item->type;
        }

        /* do various actions by flags */
        if (item->flags & A_POP) { /* pop stored state in stack */
            TParserPosition* ptr = prs->state->prev;

            pfree_ext(prs->state);
            prs->state = ptr;
            Assert(prs->state);
        } else if (item->flags & A_PUSH) {     /* push (store) state in stack */
            prs->state->pushedAtAction = item; /* remember where we push */
            prs->state = newTParserPosition(prs->state);
        } else if (item->flags & A_CLEAR) { /* clear previous pushed state */
            TParserPosition* ptr = NULL;

            Assert(prs->state->prev);
            ptr = prs->state->prev->prev;
            pfree_ext(prs->state->prev);
            prs->state->prev = ptr;
        } else if (item->flags & A_CLRALL) { /* clear all previous pushed state */
            TParserPosition* ptr = NULL;

            while (prs->state->prev) {
                ptr = prs->state->prev->prev;
                pfree_ext(prs->state->prev);
                prs->state->prev = ptr;
            }
        } else if (item->flags & A_MERGE) { /* merge posinfo with current and pushed state */
            TParserPosition* ptr = prs->state;

            Assert(prs->state->prev);
            prs->state = prs->state->prev;

            prs->state->posbyte = ptr->posbyte;
            prs->state->poschar = ptr->poschar;
            prs->state->charlen = ptr->charlen;
            prs->state->lenbytetoken = ptr->lenbytetoken;
            prs->state->lenchartoken = ptr->lenchartoken;
            pfree_ext(ptr);
        }

        /* set new state if pointed */
        if (item->tostate != TPS_Null) {
            prs->state->state = item->tostate;
        }

        /* check for go away */
        if ((item->flags & A_BINGO) || (prs->state->posbyte >= prs->lenstr && (item->flags & A_RERUN) == 0)) {
            break;
        }

        /* go to beginning of loop if we should rerun or we just restore state */
        if (item->flags & (A_RERUN | A_POP)) {
            continue;
        }

        /* move forward */
        if (prs->state->charlen) {
            prs->state->posbyte += prs->state->charlen;
            prs->state->lenbytetoken += prs->state->charlen;
            prs->state->poschar++;
            prs->state->lenchartoken++;
        }
    }

    return (item && (item->flags & A_BINGO)) ? true : false;
}

Datum prsd_lextype(PG_FUNCTION_ARGS)
{
    LexDescr* descr = (LexDescr*)palloc(sizeof(LexDescr) * (LASTNUM + 1));
    int i;

    for (i = 1; i <= LASTNUM; i++) {
        descr[i - 1].lexid = i;
        descr[i - 1].alias = pstrdup(tok_alias[i]);
        descr[i - 1].descr = pstrdup(lex_descr[i]);
    }

    descr[LASTNUM].lexid = 0;

    PG_RETURN_POINTER(descr);
}

/*
 * Add configuration oid for default parser, just match upper caller and can do nothing with it
 */
Datum prsd_start(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(TParserInit((char*)PG_GETARG_POINTER(0), PG_GETARG_INT32(1), PG_GETARG_OID(2)));
}

Datum prsd_nexttoken(PG_FUNCTION_ARGS)
{
    TParser* p = (TParser*)PG_GETARG_POINTER(0);
    char** t = (char**)PG_GETARG_POINTER(1);
    int* tlen = (int*)PG_GETARG_POINTER(2);

    if (!TParserGet(p))
        PG_RETURN_INT32(0);

    *t = p->token;
    *tlen = p->lenbytetoken;

    PG_RETURN_INT32(p->type);
}

Datum prsd_end(PG_FUNCTION_ARGS)
{
    TParser* p = (TParser*)PG_GETARG_POINTER(0);

    TParserClose(p);
    PG_RETURN_VOID();
}

#define LEAVETOKEN(x) ((x) == SPACE)
#define COMPLEXTOKEN(x) ((x) == URL_T || (x) == NUMHWORD || (x) == ASCIIHWORD || (x) == HWORD)
#define ENDPUNCTOKEN(x) ((x) == SPACE)

#define TS_IDIGNORE(x) ((x) == TAG_T || (x) == PROTOCOL || (x) == SPACE || (x) == XMLENTITY)
#define HLIDREPLACE(x) ((x) == TAG_T)
#define HLIDSKIP(x) ((x) == URL_T || (x) == NUMHWORD || (x) == ASCIIHWORD || (x) == HWORD)
#define XMLHLIDSKIP(x) ((x) == URL_T || (x) == NUMHWORD || (x) == ASCIIHWORD || (x) == HWORD)
#define NONWORDTOKEN(x) ((x) == SPACE || HLIDREPLACE(x) || HLIDSKIP(x))
#define NOENDTOKEN(x)                                                                                        \
    (NONWORDTOKEN(x) || (x) == SCIENTIFIC || (x) == VERSIONNUMBER || (x) == DECIMAL_T || (x) == SIGNEDINT || \
        (x) == UNSIGNEDINT || TS_IDIGNORE(x))

typedef struct {
    HeadlineWordEntry* words;
    int len;
} hlCheck;

static bool checkcondition_HL(const void* checkval, QueryOperand* val)
{
    int i;

    for (i = 0; i < ((hlCheck*)checkval)->len; i++) {
        if (((hlCheck*)checkval)->words[i].item == val) {
            return true;
        }
    }
    return false;
}

static bool hlCover(HeadlineParsedText* prs, TSQuery query, int* p, int* q)
{
    int i, j;
    QueryItem* item = GETQUERY(query);
    int pos = *p;

    *q = -1;
    *p = 0x7fffffff;

    for (j = 0; j < query->size; j++) {
        if (item->type != QI_VAL) {
            item++;
            continue;
        }
        for (i = pos; i < prs->curwords; i++) {
            if (prs->words[i].item == &item->qoperand) {
                if (i > *q) {
                    *q = i;
                }
                break;
            }
        }
        item++;
    }

    if (*q < 0) {
        return false;
    }

    item = GETQUERY(query);
    for (j = 0; j < query->size; j++) {
        if (item->type != QI_VAL) {
            item++;
            continue;
        }
        for (i = *q; i >= pos; i--) {
            if (prs->words[i].item == &item->qoperand) {
                if (i < *p) {
                    *p = i;
                }
                break;
            }
        }
        item++;
    }

    if (*p <= *q) {
        hlCheck ch;

        ch.words = &(prs->words[*p]);
        ch.len = *q - *p + 1;
        if (TS_execute(GETQUERY(query), &ch, false, checkcondition_HL)) {
            return true;
        } else {
            (*p)++;
            return hlCover(prs, query, p, q);
        }
    }

    return false;
}

static void mark_fragment(HeadlineParsedText* prs, int highlight, int startpos, int endpos)
{
    int i;

    for (i = startpos; i <= endpos; i++) {
        if (prs->words[i].item) {
            prs->words[i].selected = 1;
        }
        if (highlight == 0) {
            if (HLIDREPLACE(prs->words[i].type)) {
                prs->words[i].replace = 1;
            } else if (HLIDSKIP(prs->words[i].type)) {
                prs->words[i].skip = 1;
            }
        } else {
            if (XMLHLIDSKIP(prs->words[i].type)) {
                prs->words[i].skip = 1;
            }
        }

        prs->words[i].in = (prs->words[i].repeated) ? 0 : 1;
    }
}

typedef struct {
    int4 startpos;
    int4 endpos;
    int4 poslen;
    int4 curlen;
    int2 in;
    int2 excluded;
} CoverPos;

static void get_next_fragment(
    HeadlineParsedText* prs, int* startpos, int* endpos, int* curlen, int* poslen, int max_words)
{
    int i;

    /*
     * Objective: Generate a fragment of words between startpos and endpos
     * such that it has at most max_words and both ends has query words. If
     * the startpos and endpos are the endpoints of the cover and the cover
     * has fewer words than max_words, then this function should just return
     * the cover
     */
    /* first move startpos to an item */
    for (i = *startpos; i <= *endpos; i++) {
        *startpos = i;
        if (prs->words[i].item && !prs->words[i].repeated) {
            break;
        }
    }
    /* cut endpos to have only max_words */
    *curlen = 0;
    *poslen = 0;
    for (i = *startpos; i <= *endpos && *curlen < max_words; i++) {
        if (!NONWORDTOKEN(prs->words[i].type)) {
            *curlen += 1;
        }
        if (prs->words[i].item && !prs->words[i].repeated) {
            *poslen += 1;
        }
    }
    /* if the cover was cut then move back endpos to a query item */
    if (*endpos > i) {
        *endpos = i;
        for (i = *endpos; i >= *startpos; i--) {
            *endpos = i;
            if (prs->words[i].item && !prs->words[i].repeated) {
                break;
            }
            if (!NONWORDTOKEN(prs->words[i].type)) {
                *curlen -= 1;
            }
        }
    }
}

static void mark_hl_fragments(HeadlineParsedText* prs, TSQuery query, int highlight, int shortword, int min_words,
    int max_words, int max_fragments)
{
    int4 poslen, curlen, i, f;
    int4 num_f = 0;
    int4 stretch, maxstretch, posmarker;

    int4 startpos = 0;
    int4 endpos = 0;
    int4 p = 0;
    int4 q = 0;

    int4 numcovers = 0;
    int4 maxcovers = 32;

    int4 minI, minwords, maxitems;
    CoverPos* covers = NULL;

    covers = (CoverPos*)palloc(maxcovers * sizeof(CoverPos));

    /* get all covers */
    while (hlCover(prs, query, &p, &q)) {
        startpos = p;
        endpos = q;

        /*
         * Break the cover into smaller fragments such that each fragment has
         * at most max_words. Also ensure that each end of the fragment is a
         * query word. This will allow us to stretch the fragment in either
         * direction
         */
        while (startpos <= endpos) {
            get_next_fragment(prs, &startpos, &endpos, &curlen, &poslen, max_words);
            if (numcovers >= maxcovers) {
                maxcovers *= 2;
                covers = (CoverPos*)repalloc(covers, sizeof(CoverPos) * maxcovers);
            }
            covers[numcovers].startpos = startpos;
            covers[numcovers].endpos = endpos;
            covers[numcovers].curlen = curlen;
            covers[numcovers].poslen = poslen;
            covers[numcovers].in = 0;
            covers[numcovers].excluded = 0;
            numcovers++;
            startpos = endpos + 1;
            endpos = q;
        }
        /* move p to generate the next cover */
        p++;
    }

    /* choose best covers */
    for (f = 0; f < max_fragments; f++) {
        maxitems = 0;
        minwords = 0x7fffffff;
        minI = -1;

        /*
         * Choose the cover that contains max items. In case of tie choose the
         * one with smaller number of words.
         */
        for (i = 0; i < numcovers; i++) {
            if (!covers[i].in && !covers[i].excluded &&
                (maxitems < covers[i].poslen || (maxitems == covers[i].poslen && minwords > covers[i].curlen))) {
                maxitems = covers[i].poslen;
                minwords = covers[i].curlen;
                minI = i;
            }
        }
        /* if a cover was found mark it */
        if (minI >= 0) {
            covers[minI].in = 1;
            /* adjust the size of cover */
            startpos = covers[minI].startpos;
            endpos = covers[minI].endpos;
            curlen = covers[minI].curlen;
            /* stretch the cover if cover size is lower than max_words */
            if (curlen < max_words) {
                /* divide the stretch on both sides of cover */
                maxstretch = (max_words - curlen) / 2;

                /*
                 * first stretch the startpos stop stretching if 1. we hit the
                 * beginning of document 2. exceed maxstretch 3. we hit an
                 * already marked fragment
                 */
                stretch = 0;
                posmarker = startpos;
                for (i = startpos - 1; i >= 0 && stretch < maxstretch && !prs->words[i].in; i--) {
                    if (!NONWORDTOKEN(prs->words[i].type)) {
                        curlen++;
                        stretch++;
                    }
                    posmarker = i;
                }
                /* cut back startpos till we find a non short token */
                for (i = posmarker; i < startpos && (NOENDTOKEN(prs->words[i].type) || prs->words[i].len <= shortword);
                     i++) {
                    if (!NONWORDTOKEN(prs->words[i].type)) {
                        curlen--;
                    }
                }
                startpos = i;
                /* now stretch the endpos as much as possible */
                posmarker = endpos;
                for (i = endpos + 1; i < prs->curwords && curlen < max_words && !prs->words[i].in; i++) {
                    if (!NONWORDTOKEN(prs->words[i].type)) {
                        curlen++;
                    }
                    posmarker = i;
                }
                /* cut back endpos till we find a non-short token */
                for (i = posmarker; i > endpos && (NOENDTOKEN(prs->words[i].type) || prs->words[i].len <= shortword);
                     i--) {
                    if (!NONWORDTOKEN(prs->words[i].type)) {
                        curlen--;
                    }
                }
                endpos = i;
            }
            covers[minI].startpos = startpos;
            covers[minI].endpos = endpos;
            covers[minI].curlen = curlen;
            /* Mark the chosen fragments (covers) */
            mark_fragment(prs, highlight, startpos, endpos);
            num_f++;
            /* exclude overlapping covers */
            for (i = 0; i < numcovers; i++) {
                if (i != minI &&
                    ((covers[i].startpos >= covers[minI].startpos && covers[i].startpos <= covers[minI].endpos) ||
                        (covers[i].endpos >= covers[minI].startpos && covers[i].endpos <= covers[minI].endpos))) {
                    covers[i].excluded = 1;
                }
            }
        } else
            break;
    }

    /* show at least min_words we have not marked anything */
    if (num_f <= 0) {
        startpos = endpos = curlen = 0;
        for (i = 0; i < prs->curwords && curlen < min_words; i++) {
            if (!NONWORDTOKEN(prs->words[i].type)) {
                curlen++;
            }
            endpos = i;
        }
        mark_fragment(prs, highlight, startpos, endpos);
    }
    pfree_ext(covers);
}

static void mark_hl_words(
    HeadlineParsedText* prs, TSQuery query, int highlight, int shortword, int min_words, int max_words)
{
    int p = 0;
    int q = 0;
    int bestb = -1;
    int beste = -1;
    int bestlen = -1;
    int pose = 0;
    int posb, poslen, curlen;

    int i;

    if (highlight == 0) {
        while (hlCover(prs, query, &p, &q)) {
            /* find cover len in words */
            curlen = 0;
            poslen = 0;
            for (i = p; i <= q && curlen < max_words; i++) {
                if (!NONWORDTOKEN(prs->words[i].type)) {
                    curlen++;
                }
                if (prs->words[i].item && !prs->words[i].repeated) {
                    poslen++;
                }
                pose = i;
            }

            if (poslen < bestlen && !(NOENDTOKEN(prs->words[beste].type) || prs->words[beste].len <= shortword)) {
                /* best already finded, so try one more cover */
                p++;
                continue;
            }

            posb = p;
            if (curlen < max_words) { /* find good end */
                for (i = i - 1; i < prs->curwords && curlen < max_words; i++) {
                    if (i != q) {
                        if (!NONWORDTOKEN(prs->words[i].type)) {
                            curlen++;
                        }
                        if (prs->words[i].item && !prs->words[i].repeated) {
                            poslen++;
                        }
                    }
                    pose = i;
                    if (NOENDTOKEN(prs->words[i].type) || prs->words[i].len <= shortword) {
                        continue;
                    }
                    if (curlen >= min_words) {
                        break;
                    }
                }
                /* got end of text and our cover is shoter than min_words */
                if (curlen < min_words && i >= prs->curwords) {
                    for (i = p - 1; i >= 0; i--) {
                        if (!NONWORDTOKEN(prs->words[i].type)) {
                            curlen++;
                        }
                        if (prs->words[i].item && !prs->words[i].repeated) {
                            poslen++;
                        }
                        if (curlen >= max_words) {
                            break;
                        }
                        if (NOENDTOKEN(prs->words[i].type) || prs->words[i].len <= shortword) {
                            continue;
                        }
                        if (curlen >= min_words) {
                            break;
                        }
                    }
                    posb = (i >= 0) ? i : 0;
                }
            } else { /* shorter cover :((( */
                for (; curlen > min_words; i--) {
                    if (!NONWORDTOKEN(prs->words[i].type)) {
                        curlen--;
                    }
                    if (prs->words[i].item && !prs->words[i].repeated) {
                        poslen--;
                    }
                    pose = i;
                    if (NOENDTOKEN(prs->words[i].type) || prs->words[i].len <= shortword) {
                        continue;
                    }
                    break;
                }
            }

            if (bestlen < 0 ||
                (poslen > bestlen && !(NOENDTOKEN(prs->words[pose].type) || prs->words[pose].len <= shortword)) ||
                (bestlen >= 0 && !(NOENDTOKEN(prs->words[pose].type) || prs->words[pose].len <= shortword) &&
                    (NOENDTOKEN(prs->words[beste].type) || prs->words[beste].len <= shortword))) {
                bestb = posb;
                beste = pose;
                bestlen = poslen;
            }

            p++;
        }

        if (bestlen < 0) {
            curlen = 0;
            for (i = 0; i < prs->curwords && curlen < min_words; i++) {
                if (!NONWORDTOKEN(prs->words[i].type)) {
                    curlen++;
                }
                pose = i;
            }
            bestb = 0;
            beste = pose;
        }
    } else {
        bestb = 0;
        beste = prs->curwords - 1;
    }

    for (i = bestb; i <= beste; i++) {
        if (prs->words[i].item) {
            prs->words[i].selected = 1;
        }
        if (highlight == 0) {
            if (HLIDREPLACE(prs->words[i].type)) {
                prs->words[i].replace = 1;
            } else if (HLIDSKIP(prs->words[i].type)) {
                prs->words[i].skip = 1;
            }
        } else {
            if (XMLHLIDSKIP(prs->words[i].type)) {
                prs->words[i].skip = 1;
            }
        }

        prs->words[i].in = (prs->words[i].repeated) ? 0 : 1;
    }
}

Datum prsd_headline(PG_FUNCTION_ARGS)
{
    HeadlineParsedText* prs = (HeadlineParsedText*)PG_GETARG_POINTER(0);
    List* prsoptions = (List*)PG_GETARG_POINTER(1);
    TSQuery query = PG_GETARG_TSQUERY(2);

    /* from opt + start and end tag */
    int min_words = 15;
    int max_words = 35;
    int shortword = 3;
    int max_fragments = 0;
    int highlight = 0;
    ListCell* l = NULL;

    /* config */
    prs->startsel = NULL;
    prs->stopsel = NULL;
    foreach (l, prsoptions) {
        DefElem* defel = (DefElem*)lfirst(l);
        char* val = defGetString(defel);

        if (pg_strcasecmp(defel->defname, "MaxWords") == 0) {
            max_words = pg_strtoint32(val);
        } else if (pg_strcasecmp(defel->defname, "MinWords") == 0) {
            min_words = pg_strtoint32(val);
        } else if (pg_strcasecmp(defel->defname, "ShortWord") == 0) {
            shortword = pg_strtoint32(val);
        } else if (pg_strcasecmp(defel->defname, "MaxFragments") == 0) {
            max_fragments = pg_strtoint32(val);
        } else if (pg_strcasecmp(defel->defname, "StartSel") == 0) {
            prs->startsel = pstrdup(val);
        } else if (pg_strcasecmp(defel->defname, "StopSel") == 0) {
            prs->stopsel = pstrdup(val);
        } else if (pg_strcasecmp(defel->defname, "FragmentDelimiter") == 0) {
            prs->fragdelim = pstrdup(val);
        } else if (pg_strcasecmp(defel->defname, "HighlightAll") == 0) {
            highlight =
                (pg_strcasecmp(val, "1") == 0 || pg_strcasecmp(val, "on") == 0 || pg_strcasecmp(val, "true") == 0 ||
                    pg_strcasecmp(val, "t") == 0 || pg_strcasecmp(val, "y") == 0 || pg_strcasecmp(val, "yes") == 0);
        } else {
            ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                    errmsg("unrecognized headline parameter: \"%s\"", defel->defname)));
        }
    }

    if (highlight == 0) {
        if (min_words >= max_words) {
            ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("MinWords should be less than MaxWords")));
        }
        if (min_words <= 0) {
            ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("MinWords should be positive")));
        }
        if (shortword < 0) {
            ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("ShortWord should be >= 0")));
        }
        if (max_fragments < 0) {
            ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE), errmsg("MaxFragments should be >= 0")));
        }
    }

    if (max_fragments == 0) {
        /* call the default headline generator */
        mark_hl_words(prs, query, highlight, shortword, min_words, max_words);
    } else {
        mark_hl_fragments(prs, query, highlight, shortword, min_words, max_words, max_fragments);
    }

    if (!prs->startsel) {
        prs->startsel = pstrdup("<b>");
    }
    if (!prs->stopsel) {
        prs->stopsel = pstrdup("</b>");
    }
    if (!prs->fragdelim) {
        prs->fragdelim = pstrdup(" ... ");
    }
    prs->startsellen = strlen(prs->startsel);
    prs->stopsellen = strlen(prs->stopsel);
    prs->fragdelimlen = strlen(prs->fragdelim);

    PG_RETURN_POINTER(prs);
}
